Too much power sent to fan, easy or hard fix?

[Piedmont]

I bought an AC Infinity Cloudline T4 fan a few years ago ($120) that uses a temperature probe, the fan uses pwm, and has done great for my solar air heater I have. The programmable controller even allows 2 separate fans to be plugged in. I wanted to also bring the air to another area so bought another the other day. Same model, same company, they looked identical, I would later find out just how much they aren't.

So I plugged my old and new fan into the new controller (since it has 2 ports for 2 fans) turned it on and my old fan has never worked again. Looking at the fans, even though they look identical they made a change the new fans run at 24v and the old 12v... so I plugged my 12v fan into 24v power!

Each fan is $120, but worse they removed the feature I need from the new programmable controller so I need the 12v fan working. I opened up the fan, no fuse. There's 4 wires that go directly into the fans motor, I don't think it has a circuit board I think the programmable controller has the circuitry. Do you think I burned out something easy to fix? Again, the new 24v controller is working perfectly with the 24v fan in both ports so I know there's nothing wrong with the controller... but plugging the 12v fan into it's original 12v controller where it used to work yesterday the fan doesn't spin... has to be something I burned out in the fan itself. Thank you!

[budm]

Re: Too much power sent to fan, easy or hard fix?

It will a lot more helpful to see good clear pictures of what we are dealing with.

[R_J]

Re: Too much power sent to fan, easy or hard fix?

with 4 wires going to the fan, it could be a EC motor L1, L2, L3 with seperate ground? check the resistance between the wires.

[Piedmont]

Re: Too much power sent to fan, easy or hard fix?

Thank you, I'd not heard of an EC fan but I think you're correct it is. I drew this picture, I'm not sure how much it will help. I opened the junction box on the outside of the fan and this is all I saw... which then goes into the fan motor which I can't figure out how to disassemble.

Finding out what an EC fan is I do think that's what it is. From my research, connecting a 12v fan to 24v the fan should've spun fast and made a lot of noise and will burn out in short order so I would've unplugged it real quick. This fan did absolutely nothing when I plugged it into 24v, didn't spin, no noise, no smoke, no smell. Was like it wasn't powered, but it's not been able to power since.

Finding out what an EC fan is, it has circuitry inside it and I haven't figured out how to get inside the motor of the fan to expose the circuitry. I think the way it went (silently and without notice) it is an EC fan. I hope I can figure out how to pop open the motor (no screws or anything) likely I fried the circuitry but if I can figure out what the part is I can replace it.

[Retro-Hipster]

Re: Too much power sent to fan, easy or hard fix?

A photograph would just be so helpful here.. ^^; Would you be able to provide one?